Hi, I love your frame!! my DH made one frame for me, I hope this tutorial helps you!
http://elblogdenievesmaria.blogspot....or-grande.html (spanish)
I learned how to do it here
http://www.ehow.com/way_5387176_home...lt-frames.html (english)
When I finish a sectión I dismount the four bolts and roll the sandwich until a new unquilted section is set. You can see in my album the set up.
http://www.quiltingboard.com/members...27-461308.html
Enjoy your treasure!